package com.nna88.voz.swipe;

import android.app.Activity;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;

public class SimpleGestureFilter extends SimpleOnGestureListener{
	public final static int SWIPE_UP    = 1;
	 public final static int SWIPE_DOWN  = 2;
	 public final static int SWIPE_LEFT  = 3;
	 public final static int SWIPE_RIGHT = 4;
	 
	 public final static int MODE_TRANSPARENT = 0;
	 public final static int MODE_SOLID       = 1;
	 public final static int MODE_DYNAMIC     = 2;
	 
	 private final static int ACTION_FAKE = -13; //just an unlikely number
	 private int swipe_Min_Distance = 100;
	 private int swipe_Max_Distance = 350;
	 private int swipe_Min_Velocity = 100;
	 
	 private int mode    = MODE_DYNAMIC;
	 private boolean running = true;
	 private boolean tapIndicator = false;
	 
	 private Activity context;
	 private GestureDetector detector;
	 private SimpleGestureListener listener;
	 public SimpleGestureFilter(Activity context,SimpleGestureListener sgl) {
		 this.context = context;
		 this.detector = new GestureDetector(context, this);
		 this.listener = sgl; 
	}
	 public void onTouchEvent(MotionEvent event){
	   if(!this.running)	  return;  
	   boolean result = this.detector.onTouchEvent(event); 
	   if(this.mode == MODE_SOLID)
		   event.setAction(MotionEvent.ACTION_CANCEL);
	   else if (this.mode == MODE_DYNAMIC) {
	     if(event.getAction() == ACTION_FAKE) 
	       event.setAction(MotionEvent.ACTION_UP);
	     else if (result)
	       event.setAction(MotionEvent.ACTION_CANCEL); 
	     else if(this.tapIndicator){
	      event.setAction(MotionEvent.ACTION_DOWN);
	      this.tapIndicator = false;
	     }
	   }
		   //else just do nothing, it's Transparent
	}
		 
	 public void setMode(int m){
	  this.mode = m;
	 }
	 
	 public int getMode(){
	  return this.mode;
	 }
	 
	 public void setEnabled(boolean status){
	  this.running = status;
	 }
	 
	 public void setSwipeMaxDistance(int distance){
	  this.swipe_Max_Distance = distance;
	 }
	 
	 public void setSwipeMinDistance(int distance){
	  this.swipe_Min_Distance = distance;
	 }
	 
	 public void setSwipeMinVelocity(int distance){
	  this.swipe_Min_Velocity = distance;
	 }
	 
	 public int getSwipeMaxDistance(){
	  return this.swipe_Max_Distance;
	 }
	 
	 public int getSwipeMinDistance(){
	  return this.swipe_Min_Distance;
	 }
	 
	 public int getSwipeMinVelocity(){
	  return this.swipe_Min_Velocity;
	 }
	 
	 
	 @Override
	 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
	   float velocityY) {

	  final float xDistance = Math.abs(e1.getX() - e2.getX());
	  final float yDistance = Math.abs(e1.getY() - e2.getY());

	  if(xDistance > this.swipe_Max_Distance || yDistance > this.swipe_Max_Distance)
	   return false;

	  velocityX = Math.abs(velocityX);
	  velocityY = Math.abs(velocityY);
	        boolean result = false;

	  if(velocityX > this.swipe_Min_Velocity && xDistance > this.swipe_Min_Distance){
	   if(e1.getX() > e2.getX()) // right to left
	    this.listener.onSwipe(SWIPE_LEFT);
	   else
	    this.listener.onSwipe(SWIPE_RIGHT);
	   
	   result = true;
	  }
	  else if(velocityY > this.swipe_Min_Velocity && yDistance > this.swipe_Min_Distance){
	   if(e1.getY() > e2.getY()) // bottom to up 
	    this.listener.onSwipe(SWIPE_UP);
	   else
	    this.listener.onSwipe(SWIPE_DOWN);
	   
	   result = true;
	  }

	   return result;
	 }

	 @Override
	 public boolean onSingleTapUp(MotionEvent e) {
	  this.tapIndicator = true;
	  return false;
	 }

	 @Override
	 public boolean onDoubleTap(MotionEvent arg0) {
	  this.listener.onDoubleTap();;
	  return true;
	 }

	 @Override
	 public boolean onDoubleTapEvent(MotionEvent arg0) {
	  return true;
	 }

	 @Override
	 public boolean onSingleTapConfirmed(MotionEvent arg0) {
	  
	  if(this.mode == MODE_DYNAMIC){        // we owe an ACTION_UP, so we fake an       
	     arg0.setAction(ACTION_FAKE);      //action which will be converted to an ACTION_UP later.                                    
	     this.context.dispatchTouchEvent(arg0);  
	  }   
	     
	  return false;
	 }
	 
	 
	    static interface SimpleGestureListener{
	     void onSwipe(int direction);
	     void onDoubleTap();
	 }
}
